Butter both sides of the sliced bread, add slice of cheese between and grill over medium heat for 2 to 3 minutes per side, until browned to your liking.
(Note: I used the Pepperjack cheese for the ghosts so they would be white, but it does have a bit of a spice to it!)
If you plan on doing a cut out on a slice of bread, toast one side with cheese as open-face and toast the other piece of bread next to it...then press the 2 breads together to make the sandwich. Do NOT flip the grilled cheese with the cut-out facing down or you'll have a burned-cheesy mess on your hands!)